All of humanity arrives in a mysterious world filled with caves. Everyone starts with a cave and a shovel; to survive, they must dig and search other caves for resources. Xia Chengfeng, who has already cleared the game "Cave World," is overjoyed to choose the Decomposer talent at the start. He also uses divination to predict good and bad fortune in advance. "Divination shows bad luck in the cave above, the undead are wailing in the cave!" "Divination shows good luck in the left cave, sweet berries are ripe." "Decomposing the broken goblin bones, obtaining Soul Crystal +1." "Decomposing the ancient knight's long sword, obtaining Mithril +10, Strength Rune +1." ... In this cruel global otherworldly survival test, a Decomposer rises strongly!